Gila Limestone Member
Willman, H. B., Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, and Jack A. Simon, 1975, Handbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p.
M. E. Hopkins and J. A. Simon
The Gila Limestone Member of the Mattoon Formation (Newton and Weller, 1937, p. 27).
Named for Gila, Jasper County.
The type section consists of exposures about 1.5 miles south of Gila along Mint Creek (NE SW 31, 8N-9E) (Kosanke et al., 1960, p. 41, 51, 78, 79).
Extent and thickness
The Gila has not been recognized outside the type area, where it is a gray, fine-grained, dense limestone 2.5 inches thick.
Well log characteristics
Fish scales and teeth are the only fossils found.
Age and correlation
Environments of deposition
KOSANKE, R. M., J. A. SIMON, H. R. WANLESS, and H. B. WILLMAN, 1960, Classification of the Pennsylvanian strata of Illinois: Illinois State Geological Survey Report of Investigations 214, 84 p.
NEWTON, W. A., and J. M. WELLER, 1937, Stratigraphic studies of Pennsylvanian outcrops in part of southeastern Illinois: Illinois State Geological Survey Report of Investigations 45, 31 p.
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